HTTP Requests via Authenticated Proxy

A while back I posted this thread https://community.progress.com/community_groups/openedge_development/f/19/t/23788

At the time we decided to workaround the proxy issue with our own 4GL socket implementation and some external .net tools.

I've just installed 11.7.1, and am playing around with the http client again.

Is it possible to pass in username & password to the proxy server?  The request below is definitely hitting the proxy server as I'm getting a 302 (Auth Required back).

Tried both options below - is there another way to build the proxy client?  And is authenticated proxy server supported? Any top tips with this?

USING OpenEdge.Net.URI.
USING OpenEdge.Net.HTTP.IHttpRequest.
USING OpenEdge.Net.HTTP.IHttpResponse.
USING OpenEdge.Net.HTTP.IHttpClient.
USING OpenEdge.Net.HTTP.RequestBuilder.
USING OpenEdge.Net.HTTP.ClientBuilder.
 
DEFINE VARIABLE oRequest    AS IhttpRequest     NO-UNDO.
DEFINE VARIABLE oResponse   AS IhttpResponse    NO-UNDO.
DEFINE VARIABLE httpUrl     AS CHARACTER        NO-UNDO.

def var oClient as IHttpClient no-undo.

httpUrl = "http://www.theregister.co.uk".

oRequest = RequestBuilder:Get(httpUrl):Request.
oClient = new  OpenEdge.Net.HTTP.ProxyHttpClient(
                 ClientBuilder:Build():Client,
                 URI:Parse('username:password@proxyip:proxyport')).  
oResponse = oClient:Execute(oRequest).

/*
*** OR
*/

oRequest = RequestBuilder:Get(httpUrl):ViaProxy('username:password@proxyip:proxyport'):Request.
oResponse = ClientBuilder:Build():Client:Execute(oRequest).

MESSAGE
    oResponse:StatusCode
    oResponse:StatusReason
    view-as alert-box info.

Thanks